<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
<title>Source code</title>
<link rel="stylesheet" type="text/css" href="../../../../../stylesheet.css" title="Style">
</head>
<body>
<div class="sourceContainer">
<pre><span class="sourceLineNo">001</span>/*<a name="line.1"></a>
<span class="sourceLineNo">002</span> * Copyright (C) 2007 The Guava Authors<a name="line.2"></a>
<span class="sourceLineNo">003</span> *<a name="line.3"></a>
<span class="sourceLineNo">004</span> * Licensed under the Apache License, Version 2.0 (the "License");<a name="line.4"></a>
<span class="sourceLineNo">005</span> * you may not use this file except in compliance with the License.<a name="line.5"></a>
<span class="sourceLineNo">006</span> * You may obtain a copy of the License at<a name="line.6"></a>
<span class="sourceLineNo">007</span> *<a name="line.7"></a>
<span class="sourceLineNo">008</span> * http://www.apache.org/licenses/LICENSE-2.0<a name="line.8"></a>
<span class="sourceLineNo">009</span> *<a name="line.9"></a>
<span class="sourceLineNo">010</span> * Unless required by applicable law or agreed to in writing, software<a name="line.10"></a>
<span class="sourceLineNo">011</span> * distributed under the License is distributed on an "AS IS" BASIS,<a name="line.11"></a>
<span class="sourceLineNo">012</span> * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.<a name="line.12"></a>
<span class="sourceLineNo">013</span> * See the License for the specific language governing permissions and<a name="line.13"></a>
<span class="sourceLineNo">014</span> * limitations under the License.<a name="line.14"></a>
<span class="sourceLineNo">015</span> */<a name="line.15"></a>
<span class="sourceLineNo">016</span><a name="line.16"></a>
<span class="sourceLineNo">017</span>package com.google.common.base;<a name="line.17"></a>
<span class="sourceLineNo">018</span><a name="line.18"></a>
<span class="sourceLineNo">019</span>import static com.google.common.base.Preconditions.checkNotNull;<a name="line.19"></a>
<span class="sourceLineNo">020</span><a name="line.20"></a>
<span class="sourceLineNo">021</span>import java.util.Collections;<a name="line.21"></a>
<span class="sourceLineNo">022</span>import java.util.HashMap;<a name="line.22"></a>
<span class="sourceLineNo">023</span>import java.util.Map;<a name="line.23"></a>
<span class="sourceLineNo">024</span><a name="line.24"></a>
<span class="sourceLineNo">025</span>/**<a name="line.25"></a>
<span class="sourceLineNo">026</span> * This class provides default values for all Java types, as defined by the JLS.<a name="line.26"></a>
<span class="sourceLineNo">027</span> *<a name="line.27"></a>
<span class="sourceLineNo">028</span> * @author Ben Yu<a name="line.28"></a>
<span class="sourceLineNo">029</span> * @since 1.0<a name="line.29"></a>
<span class="sourceLineNo">030</span> */<a name="line.30"></a>
<span class="sourceLineNo">031</span>public final class Defaults {<a name="line.31"></a>
<span class="sourceLineNo">032</span>  private Defaults() {}<a name="line.32"></a>
<span class="sourceLineNo">033</span><a name="line.33"></a>
<span class="sourceLineNo">034</span>  private static final Map&lt;Class&lt;?&gt;, Object&gt; DEFAULTS;<a name="line.34"></a>
<span class="sourceLineNo">035</span><a name="line.35"></a>
<span class="sourceLineNo">036</span>  static {<a name="line.36"></a>
<span class="sourceLineNo">037</span>    Map&lt;Class&lt;?&gt;, Object&gt; map = new HashMap&lt;Class&lt;?&gt;, Object&gt;();<a name="line.37"></a>
<span class="sourceLineNo">038</span>    put(map, boolean.class, false);<a name="line.38"></a>
<span class="sourceLineNo">039</span>    put(map, char.class, '\0');<a name="line.39"></a>
<span class="sourceLineNo">040</span>    put(map, byte.class, (byte) 0);<a name="line.40"></a>
<span class="sourceLineNo">041</span>    put(map, short.class, (short) 0);<a name="line.41"></a>
<span class="sourceLineNo">042</span>    put(map, int.class, 0);<a name="line.42"></a>
<span class="sourceLineNo">043</span>    put(map, long.class, 0L);<a name="line.43"></a>
<span class="sourceLineNo">044</span>    put(map, float.class, 0f);<a name="line.44"></a>
<span class="sourceLineNo">045</span>    put(map, double.class, 0d);<a name="line.45"></a>
<span class="sourceLineNo">046</span>    DEFAULTS = Collections.unmodifiableMap(map);<a name="line.46"></a>
<span class="sourceLineNo">047</span>  }<a name="line.47"></a>
<span class="sourceLineNo">048</span><a name="line.48"></a>
<span class="sourceLineNo">049</span>  private static &lt;T&gt; void put(Map&lt;Class&lt;?&gt;, Object&gt; map, Class&lt;T&gt; type, T value) {<a name="line.49"></a>
<span class="sourceLineNo">050</span>    map.put(type, value);<a name="line.50"></a>
<span class="sourceLineNo">051</span>  }<a name="line.51"></a>
<span class="sourceLineNo">052</span><a name="line.52"></a>
<span class="sourceLineNo">053</span>  /**<a name="line.53"></a>
<span class="sourceLineNo">054</span>   * Returns the default value of {@code type} as defined by JLS --- {@code 0} for numbers, {@code<a name="line.54"></a>
<span class="sourceLineNo">055</span>   * false} for {@code boolean} and {@code '\0'} for {@code char}. For non-primitive types and<a name="line.55"></a>
<span class="sourceLineNo">056</span>   * {@code void}, null is returned.<a name="line.56"></a>
<span class="sourceLineNo">057</span>   */<a name="line.57"></a>
<span class="sourceLineNo">058</span>  @SuppressWarnings("unchecked")<a name="line.58"></a>
<span class="sourceLineNo">059</span>  public static &lt;T&gt; T defaultValue(Class&lt;T&gt; type) {<a name="line.59"></a>
<span class="sourceLineNo">060</span>    return (T) DEFAULTS.get(checkNotNull(type));<a name="line.60"></a>
<span class="sourceLineNo">061</span>  }<a name="line.61"></a>
<span class="sourceLineNo">062</span>}<a name="line.62"></a>




























































</pre>
</div>
</body>
</html>
